Production and recovery of olefinic hydrocarbons

Claim 2

The process of claim 1 further characterized in that said desorbent material contains normal olefinic hydrocarbons in a concentration of from about 25 to about 100 liquid volume percent of said desorbent material.

Claim 3

The process of claim 1 further characterized in that said dehydrogenation catalyst comprises an alumina base containing from about 0.10 to about 5.0 wt. percent of a Group VIII metal and from about 0.01 to about 5.0 wt. percent of a metal selected from the group consisting of Group IA, Group IIA metals, rhenium and germanium metals.

Claim 4

The process of claim 4 further characterized in that said dehydrogenation catalyst comprises a lithium modified alumina base having from about 0.10 to about 2.5 wt. percent platinum and from about 0.01 to about 2.5 wt. percent lithium composited thereon.

Claim 5

The process of claim 1 further characterized in that said normal paraffin-containing hydrocarbon feed contains paraffins having from about 6 to about 20 carbon atoms per molecule.

Claim 6

The process of claim 6 further characterized in that hydrocarbon feed contains paraffins having from about 10 to about 15 carbon atoms per molecule.

Claim 7

The process of claim 1 further characterized in that said adsorption and desorption conditions include a temperature included within the range of from about 70* F. to about 350* F. and a pressure included within the range of from about atmospheric to about 500 p.s.i.g.

Claim 8

The process of claim 8 further characterized in that said adsorption and desorption conditions include liquid phase operation.

Claim 9

The process of claim 1 further characterized in that said crystalline aluminosilicate zeolite is selected from the group consisting of type X and type Y structured zeolites.

Claim 10

The process of claim 10 further characterized in that said crystalline aluminosilicate comprises type X structured zeolite.

Claim 11

The process of claim 11 further characterized in that said crystalline aluminosilicate contains exchangeable cations selected from the group consisting of copper, potassium and sodium.

Claim 12

The process of claim 10 further characterized in that said crystalline aluminosilicate comprises type Y structured zeolite.

Claim 13

The process of claim 13 further characterized in that said crystalline aluminosilicate contains exchangeable cations selected from the group consisting of silver, copper, potassium and sodium.

Claim 14

A process for the production and recovery of normal olefins which process comprises the steps of: a. contacting a normal paraffin-containing hydrocarbon feed stream with a dehydrogenation catalyst comprising an alumina base containing from about 0.10 to about 5.0 wt. percent of a Group VIII metal and of from about 0.01 to about 5.0 wt. percent of a metal selected from the group consisting of Group IA and Group IIA metals, in a dehydrogenation zone at dehydrogenation conditions to effect production of a major reaction product of normal mono-olefins and additionally producing, as a minor side reaction product, aromatic hydrocarbons; b. withdrawing an effluent stream comprising unreacted normal paraffins, mono-olefinic hydrocarbons, side reaction product aromatic hydrocarbons and hydrogen from said dehydrogenation zone; c. separating said effluent into a liquid phase comprising olefins, paraffins, and aromatics and a gaseous phase comprising hydrogen; d. contacting at least a portion of said liquid effluent with a crystalline aluminosilicate adsorbent, selected from the group consisting of type X and type Y structured zeolites and containing exchangeable cations selected from the group consisting of Group IA, Group IIA, Group IB and Group IIB metals, at adsorption conditions to effect the adsorption of said normal mono-olefins and aromatic hydrocarbons within said adsorbent while displacing a portion of desorbent materials present within the adsorbent from a previous desorption step; e. withdrawing from said adsorbent a stream comprising desorbent material and paraffinic hydrocarbons; f. contacting said adsorbent with a desorbent material at desorption conditions to effect displacement of said adsorbed olefins and aromatic hydrocarbons from said adsorbent; g. withdrawing from said adsorbent an extract stream comprising desorbent material, aromatic hydrocarbons and olefins; h. separating said desorbent from the mixture of paraffins and desorbent and recycling at least a portion of said paraffins into said dehydrogenation zone.

Claim 15

The process of claim 15 further characterized in that said dehydrogenation catalyst comprises a lithium modified alumina base having from about 0.10 to about 2.5 wt. percent platinum and from about 0.01 to about 2.5 wt. percent lithium composited thereon.

Claim 16

The process of claim 15 further characterized in that said dehydrogenation conditions include a tEmperature included within the range of from about 750* F. to about 1,000* F. and a pressure included within the range of from about atmospheric to about 200 p.s.i.g.

Claim 17

The process of claim 15 further characterized in that said normal paraffin-containing hydrocarbon feed contains paraffins having from about 6 to about 20 carbon atoms per molecule.

Claim 18

The process of claim 18 further characterized in that said hydrocarbon feed contains paraffins having from about 10 to about 15 carbon atoms per molecule.

Claim 19

The process of claim 15 further characterized in that said adsorption and desorption conditions include a temperature included within the range of from about 70* F. to about 400* F. and a pressure included within the range of from about atmospheric to about 500 p.s.i.g.

Claim 20

The process of claim 20 further characterized in that said adsorption and desorption conditions include liquid phase operations.

Claim 21

The process of claim 15 further characterized in that said desorbent material contains normal olefinic hydrocarbons in a concentration of from about 25 to about 100 liquid vol. percent of said desorbent material.

Claim 22

The process of claim 20 further characterized in that said normal olefinic hydrocarbons present in said desorbent material have from about 4 to about 15 carbon atoms per molecule.

Claim 23

The process of claim 15 further characterized in that said crystalline aluminosilicate comprises type X structured zeolites.

Claim 24

The process of claim 24 further characterized in that said crystalline aluminosilicate contains exchangeable cations selected from the group consisting of silver, copper, potassium and sodium.

Claim 25

The process of claim 15 further characterized in that said crystalline aluminosilicate comprises type Y structured zeolites.

Claim 26

The process of claim 26 further characterized in that said crystalline aluminosilicate contains exchangeable cations selected from the group consisting of silver, copper, potassium and sodium.